[surname] Lithgow is a surname originating from Scottish as a habitational name from Linlithgow, between Edinburgh and Falkirk, which was probably named with British words related to modern Welsh llyn ‘lake’, ‘pool’ + llaith ‘damp’ + cau ‘hollow’.In the 13th and 14th centuries the name appears both with and without the first...Found on http://en.wikipedia.org/wiki/Lithgow_(surname)